Solve the Formula for the Specified Variable $I = \frac { n E } { n r + R }$

Multiple Choice

Solve the formula for the specified variable.
- $I = \frac { n E } { n r + R }$ for $n$

A) $n = \operatorname { IR } ( \operatorname { Ir } - \mathrm { E } )$
B) $n = \frac { - R } { I r - E }$
C) $n = \frac { - I R } { I r - E }$
D) $n = \frac { I R } { I r + E }$